An experimental investigation on the acoustic excitation of a thin plate by low-speed jets

Experiments were conducted to investigate the acoustic forcing of a thin al uminum plate by low-speed jets. The Mach numbers of the jets were 0.1 and 0 .2. The results indicate that the structural response is due to two causes. One is the low-frequency forced excitation of the thin plate due to the le apfrogging interaction of ring vortices. The other one is the natural frequ ency response at a higher frequency due to turbulent fluctuations in the je t. The former is directionally dependent while the latter is both direction ally and position independent. (C) 2001 Academic Press.